Wouldn't it be great if you could charge your cell phone or MP3 player the just by pulling a string?
The $40 YoGen Mobile Charger could provide emergency power in a pinch. Like today's solar chargers, the ripcord device isn't a viable alternative to the good old AC adapter, but it's handy for campers, or those who have talkative friends that use up that last few minutes of charge on your phone, while you are away from home.